Inserted-blade cutter



May 6, 1930. F. P. MILLER INSERTED BLADE CUTTER Filed May 16, 1925INVENTOR LZZe/t W ATTORNEY Patented May 6, 1930 UNITED STATES.

FRANK P. MILLER, 01 MEADVILLE, PENNSYLVANIA.

msn n'rnn-nmnn Curran Application filed May 16,

This invention relates to inserted blade rotary cutters, and has for animportant object the provision of simple means whereby the blades may,upon insertion, be quickly and Bsecurely locked against endwise oroutward shifting.

A further object of the invention is to provide a rota cutter of theinserted blade type which is o highl simplified construction,

10 easy to adjust and comparatively cheap to manufacture.

Other objects and advantages will be apparent during the course of thefollowing description.

In the accompanying drawing forming a part of this application, and inwhich like numerals are employed to designate like parts throughout thesame, I

Fig. 1 isa fragmentary perspective of a 90 milling cutter embodying theinvention;

Fig. 2 is a detail sectional view through the milling cutter;

Fig. 3 is a group perspective of a blade and the holding means therefor;

Fig. 4 is a detail transverse sectional view illustrating a slightmodification of the invention;

Fig. 5 is a fragmentary plan view through the form of inventionillustrated in Fig. 4;

Fig. 6 is a roup perspective illustrating the blade holding members for.use in connection with the form of invention shown in Figures 4 and 5.I

In the drawing wherein for the purpose of illustration are shown severalpreferred embodiments of the invention, the numeral 5 designates a bodyhaving an annular series of slots 6 for the reception of blades 7, theblades being ground in any referred manner to produce the desired e ge.

In carr ing out the invention, one side wall of each 5 0t 6 is providedwith a transverse groove 8 tapered toward the outer end thereof andreceiving an approximately semi-cir-. cular wedge block 9. The flat faceof the tapered wed e member 9 is toothed or serrated, as indicated at10, for locking engagement with the teeth or serrations 11 in theopposed face of the blade 7. The engage- 50 ment of the serrations 10and 11 positively 1925. Serial No. 30,783.

holds'the blade against endwise shifting and by reference to Figure 1,it will be seen that the teeth 11 extend beyond the sides of the block 9to provide for adjustment. Figure 3 illustrates that the teeth 11 arecontinued to the inner edges of the blade to permit of the insertion andremoval of the blade.

Each semi-circular block 9 has a threaded opening for the reception of alocking screw 14, the inner end of which is pointed for engaging theintermediate portion of a locking member in the nature of a pin 16.Figure 2 clearly illustrates that the locking pin 16 which is positionedin a groove 18 in the blade and in a recess 22 in the block 9, is forcedinto binding on agement with the wall of the roove by t e screw 14whereby to lock the blade in lace.

It will e seen that the tightening of the screw 14 will force the lockinpin 16 into binding engagement with the lade and at the same time willforce the tapered wedge block 9 outwardl into binding engagement withthe blade w ereby a double lockin effeet is brought about to positivelyhol the blade against shifting, either endwise or edgewise.

The pin 16 may be inserted by way of the groove 24 disposed at rightangles to the groove 8 and communicating with the same.

s the groove 24 extends out through both sides of the body 5, the pinmay be inserted from either side.

Attention is directed to the fact that the screws 14; are provided atthe outer ends thereof with grooves oi other suitable tool engagingmeans whereby the screws may be conveniently turned. In other words, theaccessibility of the tightening or wed ing 7 screws 14 makes it a simplematter to ad just 90 the improved rotary cutter as the occasionrequires.

f'Figure 2 plainly illustrates that the screw *14 serves the dualpurpose of forcing the pin 16 into binding engagement with the blade tohold the blade against outward shifting and forcing the wedge'block 9outwardly and laterally into binding engagement with the blade 7 In theform of invention illustrated in Figures 4 to 6 inclusive, the wedgeblock 90 which is in the form of a semi-circle is provided with a slot91 for the entrance of a comparatively short locking pin 92 which may beforced into engagement with the blade 93 by means of the locking screw94 threaded into the a tapered block 90. The pin 92 upon being passedthrough the slot 91 is received in a longitudinal groove in the opposedside of the blade. This form of invention is especially adapted for usein a reaming bar where it is not convenient or possible to insert thelocking pin from one end of the bar.

Attention is especiall directed to the fact that the slotting of thelock 90, as indicated at 91, cannot result in the spreading of the blockfor the reason that the engagement of slot 91 does not destro theserrations 96 at opposite sides of the slot with theserrations on theopposed side of the blade 93 "prevent this. In other words, the

or reduce the effectiveness of the wedge b ock. v

- blade and hold the same in adjusted position.

a and engaging and forcing the a block carried thereby,

:2. A cutter comprising a body, a blade and a pin engaged with theblade, and a screw carried by the block (pin into binding engagementwiththe bla e and simultaneously forcing the block outwardly, therebeing means whereby the block is moved latorally into flat and uniformpressure engagement with the blade to brace the blade and hold the samein adjusted position, said block being provided with means opening outthrough one side thereof for the receptionof said pin.

3. A cutter comprising a body, a blade and a block carried thereby, apin engaged with =tbe blade, and a screw carried by the block andengaging and forcing the pin into binding engagement with the blade andsimultaneously forcing the block outwardly, there being means wherebythe block is moved laterally into fiat and uniform pressure engagementwith the blade to brace the blade and hold the same in adjustedposition, said block being provided with a recess opening out throu oneend thereof and adapted for the insertion and removal of said pin.

4. A cutter comprising a body, a blade. and a block carried thereby andhaving the opposed surfaces thereof provided with intertting serrations,a locking member engaged with the blade, and a screw having threadedengagement with said block and having the forward end thereof taperedfor engaging and forcin the locking member inwardl and lateral y intobinding engagement wit the blade and simultaneously forcing the blockoutwardly, there being means whereby the block is moved laterally intouniform pressure engagement with the blade to brace the blade and holdthe same in adjusted osition. 5. A rotary cutter having a slot and atrans verse groove in one wall of said slot, a blade in said slot, ablock received in said groove and having a slot opening out througn oneside thereof, a pin in said slot and said block and adapted to engagesaid blade, the slot in said block forming a passage I01,S8ld pin, andmeans carried by said block to force the pin into locking engagementwith said blade and to force the block into binding engagement with saidblade.

6. The construction set forth in claim 5, said block and said bladebeing provided with interfitting serrations to hold the blade in placeand to hold the block against spreading.

7. In a cutter, a bod having a slot, one side of which is forme with agroove having a smooth tilted wall, a blade in said slot, 2. block insaid groove, and a screw having threaded engagement with said block tourge the block endwise in one direction into uniform pressure engagementwith the tilted wall of the groove and the opposed side of the blade,there being means responsive to the screw pressure to urge the blade inthe direction opposite the endwise direction in which the block isurged.

In testimony whereof I aflix my signature.

FRANK P. MILLER.

